aplay block at snd_pcm_writei / rw -> mmap replacement issues

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Hi,

For alsa 1.0.17 & 1.0.18, aplay needs to use mmap
interleaved (option -M) in order to play a 6ch 16 bits
pcm file to plug:surround51 , why is this suddenly
required now? I am moving up from 1.0.14 .

If aplay runs without -M, it will block at
snd_pcm_writei , which is a "rw interleaved" functions
call, but this function used to work in previous alsa
version (1.0.14 in my case).

Why is the code that using snd_pcm_writei, now doesn't
work, and has to work using snd_pcm_mmap_writei now?

I have filed a bug at
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4326


Thanks.
sodium



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